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(A) CVs of HeLa cell suspension (2.0 × 105 cells·mL−1) treated during 30 h with 20 μM of heavy metals solutions. (a) no HM, (b) Zn2+, (c) Pb2+, (d) Cu2+, (e) Cd2+, (f) Cr6+; (B) Peak currents obtained after exposure to different concentrations of Cr6+. Reprinted from [135] with permission from Elsevier.
